triplet bike

Hi everybody, I am a fit 55 year old cyclist with a 13 year old son, 100 pounds and a 11 year old son, 90 pounds. I am 175. I am interested in a custom cycle that would fit us all and allow for comfortable growth adjustments. The co- motion looked nice but I was wondering if any of you had some ideas. My sons like cycling individualy but I wanted something we could do together. also wondering about helmit options that allow rider conversation at a reasonable volume and clarity. I live in flat , windy indiana if any importance kn that. thanks for any input